How did you end up solving it?
Slif
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Thank you for the writeup!
This is what did it for me! The name of the file was "Font_Name.otf" but the name of the font was "fontname" which meant Font.custom("Font_Name") wouldn't work. Great link, thank you!
Likely a dependency or library feature you're using, but at least your warning makes sense. I was (and still am) getting this warning weeks/months before 14.4 was released.
Done! Feedback FB15621066 submitted and attachments uploading now.